154 CODIFICATION OF INTERNAL REVENUE LAWS SEC. 1020 . INTEREST ON EXTENDED PAYMENTS. (a) TAX SHOWN ON RETURN.- If the time for payment of the amount determined as the tax by the donor is extended under the authority of section 1008 (b), there shall be collected as a part of such amount, interest thereon at the rate of 6 per centum per annum from the date when such payment should have been made if no extension had been granted, until the expiration of the period of the extension. (b) DEFICIENCY.- In case an extension for the payment of a de- ficiency is granted, as provided in section 1012 (i), there shall be collected, as a part of the tax, interest on the part of the deficiency the time for pavment of which is so extended, at the rate of 6 per centum per annum for the period of the extension, and no other interest shall be collected on such part of the deficiency for such period. SEC. 1021. INTEREST ON DEFICIENCIES. Interest upon the amount determined as a deficiency shall be assessed at the same time as the deficiency, shall be paid upon notice and demand from the collector, and shall be collected as a part of the tax, at the rate of 6 per centum per annum from the due date of the tax to the date the deficiency is assessed, or, in the case of a waiver under section 1012 (d), to the thirtieth day after the filing of such waiver or to the date the deficiency is assessed whichever is the earlier. SEC. 1022. INTEREST ON JEOPARDY ASSESSMENTS. In the case of the amount collected under section 1013 (f) there shall be collected at the same time as such amount, and as a part of the tax, interest at the rate of 6 per centum per annum upon such amount from the date of the jeopardy notice and demand to the date of notice and demand under section 1013 (i), or, in the case of the amount collected in excess of the amount of the jeopardy assessment, interest as provided in section 1021. SEC. 1023. ADDITIONS TO THE TAX IN CASE OF NONPAYMENT. (a) TAX SHOWN ON RETLRN.- (1) PAYMENT NOT EXTENDED.- Where the amount determined by the donor as the tax imposed by this chapter, or any part of such amount, is not paid on the due date of the tax, there shall be collected as a part of the tax, interest upon such unpaid amount at the rate of 6 per centum per annum from the due date until it is paid. (2) PAYMENT EXTENDED.- Where an extension of time for pay- ment of the amount so determined as the tax by the donor has been granted, and the amount the time for payment of which has been extended, and the interest thereon determined under section 1020 (a), is not paid in full prior to the expiration of the period of the extension, then, in lieu of the interest provided for in para- graph (1) of this subsection, interest at the rate of 6 per centum per annum shall be collected on such unpaid amount from the date of the expiration of the period of the extension until it is paid. (b) DEFICIENCY.- (1) PAYMENT NOT EXTENDED.- Where a deficiency, or any interest assessed in connection therewith under section 1021, or any addition to the tax provided for in section 3612 (d), is not paid in full within 10 days from the date of notice and demand from the col- lector, there shall be collected as part of the tax, interest upon the unpaid amount at the rate of 6 per centum per annum from the date of such notice and demand until it is paid. (2) FILING OF JEOPARDY BOND.-If a bond is filed, as provided in section 1013, the provisions of paragraph (1) of this subsection shall not apply to the amount covered by the bond. (3) PAYMENT EXTENDED.- If the part of the deficiency the time for payment of which is extended as provided in section 1012 (i) is not paid in accordance with the terms of the extension, there
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